Give this a go:
use the Merit Dashboard, go to the Rankings tab, and filter at the top by one of the subsections you mention. The Top Merited Thread ranking on the right will adjust and show top merited threads sorted by total aggregate merits in the thread. You can additionally use the date filter to delimit the period of time that the merit aggregate applies to.

The only thing is that you will then need to locate the thread on Bitcointalk, since there is no hyperlink to the thread in this case (there is a hyperlink in many other cases such as user profile or specific post).